Along with the development of oil and gas resources, the technology of stratum testing is more and more important in increasing the recovery ratio.

随着油气田的开发，地层测试技术对提高采收率是十分重要的。

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In general, when recovery percent of reserves is lager than 50 percent at latter stage, the relation between cumulative oil and cumulative produced gas oil ratio is linear.

通常，对于可采储量采出程度大于5 0 %开发到中后期的油藏，累积产油量与累积生产气油比之间一般存在线形关系。

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Therefore, reservoir protection has been the key factor for enhancing oil and gas production and recovery ratio.

保护油气层已成为提高油气产量和采收率的关键因素。

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